digital voice with analog lines

we have a modem that comes with with a digital voice number. currently, we use a digital phone to connect to the modem directly via RJ1.

All the rooms already have a telphone point. How can we utilize this digital voice line such that all the rooms are also able to receive incoming calls and call out using the same digital voice line?
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pergrConnect With a Mentor Commented:
Digital lines are a bit different in different countries.

Most likely your phone connects to the ISDN box using a four wire cable, while the wire that goes around the house is two wire. You would need four wire to share the line several phones.

An alternative is if your ISDN box has also an output for analog phones. Such a port can be connected to the cable that goes around the house, and you can put analog phones there.
grnowAuthor Commented:
some good pointers
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